In addition, cf. A history of Marxian economics vol. 1 - 1883-1929 Howard & King- MacMillan, 1989 a very indepth study is : Gilles Dostaler - Valeur et prix : histoire d'un d=C3=A9bat -- 1978, [Paris] , Grenoble ; Montr=C3=A9al , (sorry, it is in French!) Alain Alcouffe